Hello everyone :sunny: I am modeling a Fan Coil Units + DOAS HVAC system, with Hot Water Boiler as a centralized plant. I need to define/add the part load performance curve for the boiler. When I am creating it with Honeybee, the boiler under the Hot Water Loop does not have this feature. Whereas…

I was able to find a ¿good? reference for non electric boiler performance curve here Thanks to this topic in the UnmetHours forum… However, I still dont understand if Honeybe specifies the performance curve by default based on COP, or I need to do it manually, and how? :stuck_out_tongue: In my ex…

@mrbro , You’ve been really digging into the boiler assumptions over the last few days :). I’m glad that you have been posting the questions here. You are right that some of the HVAC templates like fan coil units do not seem to be including the boiler curve in the .osm. If you give me until the e…

Thank you Chris. That would be very helpful! Sorry for the trouble :slight_smile:

@mrbro , It’s no trouble at all! You’ve already helped fix a critical issue yesterday and I’m just happy to see someone else using these detailed HVAC workflows in the OpenStudio interface other than myself. I updated the OpenStudio component such that it now writes in a default Boiler efficiency…

@chris , I’m validating my HB energy model against an IES model and need to share the automatically-assigned performance curves of various HVAC objects with my energy models. Ideally in graph format. I found the OS curve coefficients discussed in this thread, but am confused by the values. As shown …

@chris I remember that I was trying to model a hot water loop with two boilers, and OpenStudio didn’t like it if I set two boilers’ curve, but ok if I just use default curve value for one of boilers. I am sure this has nothing to do with HB, but would like to open a discussion here.

@LelandCurtis , The default bolier curve is basically just a flat line (all coefficients are either 0 or 1). I haven’t yet exposed the ability to set curves in Honeybee so, for the time being, for your validation, you’ll have to write out the .osm, assign your coeffieceints in openstudio and simula…

@MingboPeng , I am not sure about the issue you describe but it sounds like it’s a question that should be posted to unmethours where the OpenStudio developers are. Unless you are pretty sure that it’s an OpenStudio bug, in which case you should post it directly to the OpenStudio github.

@chris , What are the default curves for the various HVAC equipment? Systems 5+7 are most important to me. Can you send me a link to where this information lives? Thanks.

@LelandCurtis , I am pretty sure that all of those curves come from ASHRAE standards. Honeybee is not actually assigning the individual coefficients for the curves but they are automatically getting assigned by OpenStudio when you use the addSystem7() method, which is intended to assign a AHRAE app…

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Honeybee Boiler Part Load Performance Curve

grasshopper honeybee-legacy

hvac, energy, honeybee

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